A pump and dump stock is much different than this stock. Although I will say that if you follow this stock enough it tends to resemble a P&D. Many big time investors moving large amounts of money in and out of this company to try and make some money creates this appearance, imo.
I said this many times. I've been in this stock over five yearsand it still is a good long term investment. A long term investor ( defined as one year +)should look at these dips as buying opportunities. Apple is a great company with many great innovative ideas and a dividend better than the 10 year.