An option to filter out resteems, a search bar, these sound quite interesting. You should try to talk to the guys that made steempeak.com busy.org or @esteemapp

One thing id like to add is that steem doesnt run on a centralized server. Its not like google or facebook where the admin can simply choose to delete your data or sell it. Once a block is produced and verified by the witnesses, you yourself cannot delete/change your own content. The entire history is there forever.