All self-respecting newspaper sites have share and social-bookmarking functionality, such as links to Digg, Reddit, Fark etc.
But if the results of StumbleUpon are typical then:
- Times Online is miles ahead of its rivals when it comes to users sharing / bookmarking its pages.
- The FT has a lot of work to do.
- Adding icons for an individual service makes no difference to how often users submit a given page.