Current web application is being updated with twitter bootstrap and the UX people are hover / tool-tip happy which is leading to a very busy page.

My understanding is that tool tips should be used for icons that may not convey enough information about what they do e.g. a toolbar, but not for buttons where the text is / should be enough. 

What I'd like to know is; are there current UX guidelines for current web applications that I can use to base my assumptions on?