The #Ecency frontend allows bookmarking of your favorite posts and comments, and those bookmarks are visible only to you on all devices where you are logged in on Ecency. 🤓
Regarding searching for something on Hive, you can use #Hivesearcher (https://hivesearcher.com/) which is also created by the team which created Ecency and #Hivesigner. 🤓 In my case, I use Ecency's Advanced Search feature (https://ecency.com/search-more/?adv=1&date=all&hd=0&q=%20&sort=newest) to search for the most recent posts and comments containing my chosen search terms. 🤓🤓
Have some !LUV too! 😁