Over at the AVC.com blog noted VC Fred Wilson has written about an interesting feature that he’s seen on his Twitter timeline this morning that encourages him to engage with a friend who has recently returned to Twitter after a period of inactivity.

This is an interesting development from Twitter who, like all the major social networks, continuously struggles with the problem of retention of users, and this prompt could play a significant role in keeping people interested. After all, who doesn’t like getting a “welcome back” message from a friend?

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