Hi Shubha!

There's no "one" formula to collect and count data for altmetrics. Each major altmetrics aggregator (my company, Impactstory.org; PlumX; and Altmetric.com) use different data sources when generating an altmetrics report.

Altmetric.com does uses a weighted calculation to generate a single score that attempts to quantify type and amount of attention. It's useful to get a vague sense of attention an article's received, but single score indicators are often mistrusted in science (cf. the journal impact factor, the h-index, etc). 

So, do with all that information what you will! :)

Best,

Stacy Konkiel

http://support.altmetric.com/knowledgebase/articles/83337-how-is-the-altmetric-score-calculated

Stacy

Thanks for your reply.

shubha