BCDC bounty portal working great so far! Nice to have a regularly updated stats to track our earned stakes and it personally encourages me to keep doing the task.
is it important to post the screenshot?
No. At least not for social media bounty. I have received stakes for retweeting/sharing without uploading screenshot.
I think the screenshot is new rule from dev.
It's better to follow the rules. Just my two cents
Uploading screenshot for each submitted action is too much for me, and all my Twitter/FB actions are approved without uploading any screenshot. So I can safely assume that it is optional for social media bounty.