Mobile versions of sites, and mobile apps to replace sites (facebook, reddit) piss me off.
For starters, 99% of mobile sites/apps solve the problem of "How do we adjust our site designed for 1920x1080 down to fit a tiny phone screen?" by just cutting out over half the useful features. Don't have room for a search bar? Delete it. Don't have room for formatting options? Delete them. Don't have a keyboard for useful shortcuts? Delete all the shortcuts.
To something E-rated! Check it out and give the author some love.