No, those addons aren't interacting with anything outside of the game. They store information in their saved variables files just like any other addon. The out-of-game clients then parse the SV files and send the information.
As stated, addons are not permitted to interact with anything outside of the game. I don't think there's really any way to do it, and if there is, it would most certainly be considered an exploit.
The best you could hope for, is an out-of-game program that wrote twitter information into an addon's SV file, but new tweets would only be available to the addon when initially logging in, as a ui reload would overwrite the SV file with whatever is currently in memory.
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