Just below the What's New section there is a Recommended For You section.
Currently I don't have it enabled, but other than the list of software, what data does it take about what you have installed?
Does that list of software include software installed via Synaptic or
Does it take data about the time (or order) of installation?
What does it use that data for? (Other than recommendations, if any)
How does it work out what software you might like from that? (For example, does it take just the category, or more in depth categorisation)?
If I have A installed and it recommends C, and I then installed B, could that mean it might stop recommending C (maybe because B and C are very similar)?