Are you seeing bugs or design problems on the new web interface that mastodon.social is currently testing? You can give feedback directly to the Mastodon core developers on their new forum at:
:Mastodon: https://community.joinmastodon.org
If you post your comments in the forum, they are a lot more likely to have a direct effect on the design of the new interface.
@FediTips Man it's too bad they don't have their own social media type app to post comments on.