I don't get it.
Twitter doesn't have privacy settings like Facebook does (that I know of). If you post, then you've made a public statement. I don't see how searching a hastag that is related to serious social unrest to be "profiling", unless they are going out willynilly and arresting anyone who used the hastag.
Basically, as far as I can tell, anything you post on Twitter is fair game for LEOs under any circumstances.