What popular, large commercial websites run PostgreSQL?

I'm just about in the position of making management see sense and switch from
Informix (terrible database, unsupported and full of bugs) to PostgreSQL. However
what would really convince them would be a list of large commercial websites
which run PostgreSQL as their main database server. Is there any webpage or
other resource which lists PSQL-backed sites, or can anyone name any sites
running PSQL for me?

Thanks in advance,

Rich.

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