You have applied for entry clearance as a visitor to the United Kingdom for 3 days. I have considered your application against paragraph 46G of the Immigration Rules.
Home Office records show that you have previously been refused a United Kingdom visa (shefo/*****). However each application has to be assessed on its own merits using the information and evidence submitted. It is worth noting, that I am not satisfied you have addressed the concerns raised by the previous Entry Clearance Officer.
You have stated on your application that you are single and are a non working student at ***** University. I note that you have stated you do not receive an income; however you state that you spend £160 per month on living expenses; it is unclear how you are able to meet this expense. You have provided a bank statement with a closing balance of only 10260 Rub (£102).
Whilst, you state the cost of the visit to you will be zero; the onus is on you to qualify for entry clearance based on your own circumstances and your own intentions. You have said that Facebook will be paying for all the expenses of your trip to the United Kingdom and I am satisfied that they are in a position to do so. However, whilst I take this into account in assessing your proposed maintenance and accommodation in the UK, that is only one aspect of the visitor rules and this sponsorship does not satisfy me of your own intention to leave the UK on completion of your visit.
In light of the above I am not satisfied that you are genuinely seeking entry as a Business visitor or intend to leave the United Kingdom at the end of your visit. 46G (i)(ii). In light of this I am not satisfied that you intend to undertake one of the defined business activities. 46G(iii)
I have therefore refused your application because I am not satisfied, on the balance of probabilities, that you meet all of the requirements of the relevant Paragraph of the United Kingdom Immigration Rules.