Depending on the journal, if the journal is open access then placing it on this platform means you attached the journal link to the article (s). However if the journal is closed access or for sales then you can place the abstract here and add the link to where the full article can be access. Other closed access journals also have Author rights, that is
As an author you have certain rights to reuse your work on social media such as this but they have more information on author rights in the AUTHOR INFORMATION PACK. Some allows the reviewed manuscript but not edited and published version to be use on social media for peer review. So it all depends on the journal terms and conditions.
Yes, it depends on the journal, with a general difference between "green open access" and "gold open access". Green journals allow self-archiving by the authors themselves. Gold journals create their own public archives, on which you can put a link.
These are the two main models, but journals can ask to respect additionnal conditions. Most of the time, only a specific version of your paper can be uploaded. For examples, some journals allow self-archiving but only for pre-print version.
For further information, take a look at this list of journals, classified on a scale ranging with four colors, depending on their copyright policy : http://www.sherpa.ac.uk/romeo/journalbrowse.php?la=en&fIDnum=|&mode=simple
I come back with some news from France. French Government is about to pass a bill about copyright and IT. One section grants to researchers the right to publish their papers and works on open access platforms, even if the copyright has been transfered to a journal.
There are some conditions :
- the papers must have been held by public funds at least for a half;
- only the "pre-published" version of the papers can be displayed on platforms;
- the right is granted at the end of a certain period, which is different according to the matter of the paper (12 months for natural, medical and technical sciences, and 24 months for human sciences, from the first publication);
- commercial use is excluded.
The bill itself has been discussed on an open access platform. Now, it shall be voted by Parliament. So, this section may still evolved.
To be continued...
By the way, does anyone know if a such bill exist in your countries ?