Although I am not on Twitter myself [the reasons why would take an entire post], I am all about passing on as much information as possible here on RA for All.
There have been a series of posts by Matt Anderson, editor of the online newspaper Library Science Daily, about the best tweeters in the library world.
Here is his list of the 100 libraries to follow on Twitter.
And here he compiled the 125 Librarians to follow.
These are all libraries and librarians, so the focus is not only RA specific.
However, the library marketing team at Harper was inspired by Anderson and compiled their own list of the most active librarians they follow on Twitter. This list is the better one if you are looking for the best Librarian Tweeters from the RA perspective.
My pick, Kaite Stover, but you have to register to follow her.
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