Okay, tip no. 1: use a site like hellotxt or ping.fm to simultaneously update all your social networking sites at the same time - Twitter, Facebook, etc. Really saves time. Of course you still need to go on to the social networking sites individually to check messages, answer questions, post replies, etc., but you don't have to go on to five or ten different sites individually to enter each update; you can do it all at once.
Tip no. 2: See my thread here on the wf in which I just linked to an excellent article on businesswire? You can do the same - if you see a good, genuinely helpful article on another website, post a link to it! Do it here, do it on your social networking sites...this way you are helping your followers by steering them to useful advice, and getting your name out there in front of people, and showcasing the work of others in your field, which is always a nice thing to do - and you didn't even have to write the article!
Tip no. 3: I have dozens of blog posts on my website which tell people how to write press releases, how to SEO press releases, etc. - and I post links to old blog posts on a regular basis and tweet the links, facebook update them, put them on Linkedin...and I always get a lot of thanks and a lot of retweets every time I do this. Odds are that MOST of the people following me, friending me, etc., did not see the old post, so I am getting more mileage for my writing. I obviously don't want to post ONLY links to old material, I wouldn't post the same link to the same post every day, but if I post a link to a different old article of mine once a week - and rotate which old article I am linking too - I get to recycle good material and get fresh exposure for it.
What are your lazy person's ways to update your social networks?