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I won't not trust any closed source OS now. Open source is not necessarily a silver bullet, but it makes the code transparent and many people can verify it instead of relying on others to do so.

I just try to make a point not to post anything I wouldn't want the whole world to know. It would suck to have my steemit wallet filched though... I worked hard for what little I have!

Well first of all you should only login with your posting key, while keeping the master key in a safe, offline place.

That should eliminate about 95% of the threat. Then you plug the remaining 4.9999% with a safe operating system and safe browsing practices (like not downloading unknown files ,etc..). The remaining 0.0001% will probably be left to luck.

Sound advice!