If you edit using iD (the default in-website editor), and you explicitly choose to request Mapillary imagery (at least two extra mouse clicks) then yes, in the

If you edit using iD (the default in-website editor), and you explicitly choose to request Mapillary imagery (at least two extra mouse clicks) then yes, in the abstract Facebook will be aware that you used Mapillary imagery to aid your contributions. Similarly other editors (programs and apps) may have Mapillary integration; you'll have to check with them but typically you'll be aware if you're using Mapillary imagery (you should, to be able to attribute correctly). Finally some OSM apps (e.g. OsmAnd) use Mapillary to provide street-level imagery (Google StreetView-style) for general use; if you're concerned you can probably disable this. The main website does not at present integrate Mapillary directly. Of course, this could change in future if they decide to make it more interactive, but even then it seems likely that this would only be in the case the user asks to see street-level imagery.