The 7 must-know numbers of the week, starting with the few agents who value Twitter

The percentage of Real Estate Institute of Victoria members who endorse Twitter as a way to connect with potential vendors and buyers. “Online is … clearly having an impact, but that does not extend to social media,” says REIV chief Enzo Raimondo.

The increase in Australian house prices by late 2013 predicted by Australian Financial Revieweconomic writer David Bassanese. Bassanese, a 20-year economics veteran, also expects interest rates to fall by 100 basis points over the next 12 months – taking the cash rate to 2.5%.

The price hopes for Lexington, at Moyston near Ararat, the childhood home of Tom Wills, the inventor of the Australian rules game. The property was established in 1840 by Horatio Wills, whose son, Tom, inspired by a game he played with the local indigenous children, is credited as inventing the country's most popular sporting competition.

The price hopes businessman Simon Tripp has for Jabulisa, his impressive 6.9-hectare Sydney northern beaches acreage. The Tripps have reportedly spent millions of dollars developing Jabulisa, described as the "ultimate family resort".

The increase in house prices in the central western NSW town of Mudgee, a hotspot for mining, agriculture and tourism, in the past year, according to Residex. Mudgee was the best-performing house market of NSW for the year. 

 Brownlow medalist Jobe Watson's vendor bid for his three-bedroom Albert Park investment cottage, which lingers unsold on the market after its September 1 auction.

The amount by which Australian house prices could rise in 2013, according to SQM Research, provided that the eurozone holds together and the RBA does not make dramatic interest rate cuts.