The advantages of the Internet: The abundance of information provided by the Internet to its pioneers in various fields, where the Internet is an important source of information. Easy access to information. Speed thus saving time and effort on the researcher. Effectiveness. Internet information is modern and subject to modernization over time as it is not characterized by stagnation or stop at a certain level, the knowledge of humanity is endless and inexhaustible and has no limits. Global. Ability to use 24 hours at all times. Prevent the monopoly of information.

Wonderful experience to harness the varied online tools for research purposes. You learn, unlearn and relearn what actually works and what does not work.

With respect to all the given answers here, I would like to add few more pros and cons plus possible challenges, usually based on experiences of mine or some of my colleagues that I can recall at the moment, as follows:

a) Advantages:

Finding several and different unprocessed and raw data through different sources in the case they are open data sources. Possibility of finding the right person and/or team during your research that there would be the chance to ask directly from the very right one no matter to have a necessarily face-to-face interaction.

b) Disadvantages:

Facing redundant and/or partially redundant data, coming from different sources that may even seem different at their first appearance.

c) Challenges:

How to express what exactly you are looking for by applying the very right words or phrases, through searching engines or links to get the satisfactory answer. How to find and track the information you need through tons of irrelevant data that only few parts could be probably beneficial for your purpose.

Disadvantages depend on the sorts of questions asked and where one looks for answers. Here are a few more disadvantages:

Population is not clear.

Users with multiple accounts may provide multiple answers.

Accounts might not all be human.

Unequal use patterns.

as we all know people are busy with their social media so online research have to faces following problem

population is low

not reliable answer

manipulation of answer get high chances as people are just targeting to finish in hurry

with out understanding people put tick mark in answer

and last noone cares your research properly

If you can choose by yourself, would you prefer CAPI or paper survey? Please explain your reasons

Problem with acronyms: There are many possible things that CAPI could refer to: https://acronyms.thefreedictionary.com/CAPI. In this case the most reasonable is computer-assisted personal interview.

As the person interviewed I would prefer CAPI. It wastes less paper and I can often do it in less time than a paper survey. If in person I do not have to deal with the person conducting the interview, and if by mail I do not have to mail it back.

As the scientist, the answer is less clear. In many ways the paper survey provides more information. I know who the survey was sent to, and I can try and get a reluctant individual to take the survey even if their first inclination is to discard the survey. I also don't have to worry about individuals with limited or no computer access. My results could be weaker if I have to include "computer use" as part of the definition in describing my target population. That said, it is not all that different than sitting at the corner of a street and asking people to take a survey, or mailing it to them. You just need to match the survey method to the target audience and be aware that the method may exclude some subpopulations.

http://www.psychwiki.com/wiki/What_are_the_advantages/disadvantages_of_doing_internet_research%3F

https://www.ukessays.com/essays/information-technology/advantages-disadvantages-of-internet-for-research-purposes-information-technology-essay.php

http://www.restore.ac.uk/orm/tutorresources/activities/advantages%20and%20Disadvantages.ppt

Of the advantages of conducting research on the Internet : Ability to obtain a large sample, which increases statistical power

Advantage: Easy to get access to lots of information

Disadvantage: Not all information can be verified

Among the advantages of conducting research on the Internet: Reduced cost of conducting research