SO works by the following rule: garbage in - garbage out. Lets have a look at the question that you asked and we might figure out why it was down voted and how to improve your experience on SO.
PersonalityMatch.net - online dating without Profile Pictures
So far I've run into only one issue with Twitter bootstrap. It does not support padding on containers or grid components (<div class="span6">) out of the box. This means that if you'd like to have some colorful background with white general area, you'll run into this issue. Tweaks are possible, but the workarounds are awkward. Other than that it's pretty awesome and saves a lot of time on development.