Selected answers from the Dumb SEO Questions Facebook & G+ community.
Marina Dolcic: You dont. Spelling and grammar mistakes reduce the trustworthiness of the content
Chris Boggs: Agree with Marina about on-page, but a couple misspelled anchor links are sometimes worth testing, especially if a common misspelling.
Michael Martinez: It depends on how popular or common the mis-spelling is. The search engines may suggest alternative queries but if people see satisfactory results in the query with the mis-spelled term they`ll click through anyway.
Also, if they are mis-spelling words when using your site search tool chances are very good they aren`t finding what they are looking for. It`s a good idea to maintain pages for frequently used mis-spellings (per your site search logs) that redirect to the pages with correct spellings or some sort of list of mis-spelled words that can be shown to your visitors, where the list links to pages using the appropriate spellings.
Chris Boggs: sorry Michael but I couldn`t help point out the irony ;)
Michael Martinez: Chris Boggs That irony is pointed out to me every day because I use so many editing tools they all disagree on basic spelling rules. I just go with whatever I feel like typing at the moment.
Curtis Melancon: Do it on a new page. It’s a hidden gem when you find them.
Zachary Toto: As mentioned above, in some cases it may be worth keeping track of frequently misspelled words and redirecting to the correct content. Sometimes it may not be worth troubling yourself over.
Chris Boggs: One time in an agency we wrote a successful piece of content to be able to rank for "stationary" versus the correctly-spelled target "stationery." I believe it still ranks. ;)
Neil Cheesman: Don`t the search engines `generally` pick up on the `mis-spellings` anyway? and therefore would rank the best web page with the correct spelling.
Michael Martinez: They often make bizarre decisions about how to serve results for words that are spelled incorrectly.
I look to site search data to guide my choices about whether to optimize for misspellings. Most sites use native site search tools and they don`t have the resources that Bing and Google have.
Hence, creating content for the alternative spellings sometimes makes a lot of sense.
Neil Cheesman: I guess it may depend on the words etc... I guess there will be a `list` somewhere of most commonly mis-spelt words... entered...
Michael Martinez: Neil Cheesman We use the Search Meter plugin for WordPress sites. It tracks recent site search queries. Another plugin that provides some data is called Better Search. It changes how WordPress site search works (just an SQL trick - nothing too exciting).
Neil Cheesman: Michael Martinez Are these sites ON a site or in the Serps?
Michael Martinez: Neil Cheesman These are on-site searches, not in Bing or Google search results. If you put a search box on a large Website people will use it.
Hey guys, what do you say about optimize for the wrong spelling? 
