It really depends on the "feel" of the application. For instance, Outlook and Twitter are productivity/communications applications to me. Therefore, I feel as if flagging is an action whereas starring is favoriting/liking an item.
Other sites, like digg, are just community dumping grounds in which moderation is necessary. There, flagging is a notification to an admin and starring would be more appropriate for a positive response (for action, favoriting, etc).
I guess, what I am trying to say is - if moderation is necessary, if there is the need for a negative connotation, then the flag feels that way. But, if there is no need for a negative connotation (like my email or Twitter, which don't require moderation) then a flag doesn't feel bad at all, it just feels important.
Other sites, like digg, are just community dumping grounds in which moderation is necessary. There, flagging is a notification to an admin and starring would be more appropriate for a positive response (for action, favoriting, etc).
I guess, what I am trying to say is - if moderation is necessary, if there is the need for a negative connotation, then the flag feels that way. But, if there is no need for a negative connotation (like my email or Twitter, which don't require moderation) then a flag doesn't feel bad at all, it just feels important.