Do not use OP.GG to check your Rank and Tier's MMR

Ok so I assume that some or most people who play League use OP.GG to check their MMR and see where they measure up to their rank and tier's average MMR. Well refresh the page several times (in short intervals) and the number will change from high to low. This is because the website itself cannot average out every single players MMR in that Tier and Rank. Most likely it takes your placement in the World rankings and averages the MMR of the closest 50 or 100 people to you. So what this means is that among the thousands of people who have the same tier and rank as you OP.GG will compare your MMR to the average of those 50-100 nearby your own rank, the average they give can be skewed by smurf accounts which would have higher MMR than what the actual average of that Tier and Rank is.

TL;DR OP.GG is not accurate when it comes to comparing your progression to the average progression of your Tier and Rank