This driven and playful name would be ideally suited to a social or dating brand.
The word "PassionBlock" contains 12 characters and three syllables. Successful brands using three syllable names include Sainsbury's, Toshiba and KFC.
Passionblock.com is a dot com domain. Dot com domains are synonymous with websites. Once secured, a dot com all but guarantees no-one else can outrank you for your own name in the long run.