The search engine
algorithms change frequently, so they stay abreast of changes by reading blogs and industry publications.
Not exact matches
But then Facebook
changed its
algorithm so that these articles and apps didn't show up as
frequently, and readership plummeted overnight.
But the company said that decline was the result of a conscious effort to rapidly expand its available inventory and
change its
algorithms to distribute ads more
frequently throughout each day.
First Google, which announced today that it's making major
changes to its search
algorithms to update its main search index more
frequently.
Given the fact that search engines
frequently change their
algorithms and so also the websites that appear in the search results further complicates the matter and makes the result of your selections potentially more random.
Technical Errors: We all know that Amazon
frequently — and unpredictably —
changes their
algorithms.
There are seasonal effects; as the number of books grows, books with higher sales ranks sell more
frequently than they used to; Amazon often
changes the
algorithm, etc..
However, because Facebook
frequently changes its
algorithms and advertising options, you may need to invest in training or hire someone part - time to best manage your page.
There is competition for keywords, and the search engines
change their
algorithms frequently.