Although it had one of its most eventful and positive weeks in a long time, the AVZ Minerals Ltd ( ASX: AVZ ) share price finished the week on a low today. The lithium-focused mineral exploration company's shares finished the day with a decline of 4.5% to 10.5 cents. Why did AVZ Minerals' shares sink lower today? This morning AVZ Minerals once again had to release a response to a Twitter post from one of its paid advisors. The Twitter post in question came from a principal of its strategic advisor Airguide International and involved a table comparing AVZ Minerals to a number of rival lithium miners. The table presented information which included a mineral resource estimate and production cost estimates for AVZ Minerals. This was done despite the fact the company has yet to report a mineral resource estimate in accordance with the JORC Code 2012 or technical studies involving production cost estimates to a level where it has reasonable grounds to disclose forecast financial information to the market.