Just to be clear, my goal here is not to game trends, it is in fact the opposite, I want to find a way to make sure I will not interfere/inject into a trend.
Looking at the twitter-text gem regular expressions https://github.com/twitter/twitter-text-rb , for hashtags anyways, the underscore is a valid character so clearly #somehashtag will be different than the _somehashtag plain word (because #somehashtag and #_somehashtag are both valid and different and _somehashtag could possibly(?) interfere with #_somehashtag but not with #somehashtag).
Now I ear your comment as basically “if you play with fire, you might get burned” but it would be useful to clarify the boundaries to help those with noble intentions O:)
Thanks,
Colin