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I think it's important to note that we currently have no strong evidence that tweets (favorites or RTs) directly impact rankings. Google cut off the Twitter "firehose" data and claims they don't factor in social as a direct ranking factor (even Google+). I think "direct" is an important word there, and that makes sense - social is relatively easy to manipulate, at least in terms of raw signals. They're still trying to figure out the right mix. That caveat aside: (1) I agree with Ratan that RT's are generally more advantageous indirectly. They expose more people to your tweet, and those people will click through, drive up engagement, and potentially link to you. Eventually, this can have an indirect but very real impact on SEO. It's unlikely that favoriting has much impact even indirectly, IMO. (2) Social signals, like RTs, can definitely be used by Google for indexing new content. Content posted on G+, for example, is indexed incredibly fast from decent accounts (not just big names, but any account that's clearly real). This isn't "ranking" per se, but you can't win if you don't play, so it matters. (3) I strongly suspect social will be a corroborating layer, if it isn't already. In other words, if you have a piece of content with 500 +1s but no tweets, not Likes, and no links, that's going to look like spam to Google. If that same piece shows signals across very dimensions, then those 500 +1s may have an impact. RTs may eventually be part of that equation (personally, I don't think they are right now).

No one replied ?

@monali, You really no need to care this, it is being counted as internal links.

here is one I "borrowed" http://www.artdriver.co.uk/wp-content/uploads/2012/05/google-webmaster-tools-index-new-content.jpg