That may very well be, but personally, I have no objection to this at all, b/c:

- supporting Twitter does not do any damage (unless you'd argue it's subject to the mass surveillance problem and should therefor be avoided)

- you're not being locked in, you can drop it at any time without any consequences

That "get" will quickly become a "got", as they've finally moved away from github.com/twitter to their own independent github.com/twbs repository, as was the plan for a long time: http://blog.getbootstrap.com/2012/09/29/onward/